Why Do We Yawn?
User SciShow Kids on YouTube,
We yawn a lot when we're tired or warm, and sometimes we even yawn just because we see other people yawning! But why do we yawn…
We yawn a lot when we're tired or warm, and sometimes we even yawn just because we see other people yawning! But why do we yawn…
Gli sbadigli servono a scambiare aria con l'esterno per ridurre la temperatura della nostra «testa» http://www.frontiersin.org…